The St. Davids plate. Relief from Copernicus GLO-30; rivers and lakes from USGS NHD; watersheds from the USGS Watershed Boundary Dataset; roads and city limits from Census TIGER 2024.
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77° on Nov. 12, 2015, the hottest reading for this week of the year since 1948. Next is 76° in 2020.
St. Davids’s center stands about 380 ft above sea level. Within three miles the land runs from 190 ft to 540 ft, a difference of 350 ft: rolling country. The highest named summit within 15 miles is Diamond Rock Hill, about 700 ft, 7 miles west-northwest.
Under the town center the state geologic map shows Mafic gneiss, from the Precambrian.
The section below crosses 12 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 29×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Mica-schist. Age: Paleozoic, 252 to 542 million years old. About 5 mi of the line.
Muscovite-gneiss. Age: Precambrian. About 4 mi of the line.
Gneiss. Age: Precambrian. About 3 mi of the line.
Schist, phyllite. Age: Paleozoic, 252 to 542 million years old. About 2 mi of the line.
Sand. Age: Miocene, 5.3 to 23 million years old. About 2 mi of the line.
Limestone. Age: Cambrian, 487 to 542 million years old. About 2 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 6 smaller units along the line are not listed.
Heights from Copernicus GLO-90 (a surface model: it includes buildings and tree canopy); summits from USGS GNIS; rivers from USGS NHDPlus HR; rock from the USGS State Geologic Map Compilation.
A raindrop that lands in St. Davids reaches Delaware Bay and the Atlantic Ocean by way of Ithan Creek, Darby Creek and the Delaware: about 75 river miles.
50 miles of the trip are on the Delaware.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of St. Davids; river miles along the main stem, rounded.
St. Davids has a humid subtropical climate. Summer afternoons average 89° in July; winter nights fall to about 23° in January. A normal year brings about 25 inches of snow; with the rain, that comes to about 51 inches of water.
On November 14 St. Davids normally reaches 57° and falls to 35°. The record high is 74°, in 1955; the record low 19°, in 1986. The most rain on this date, 0.70 in, fell in 2020.
Normals 1991–2020 and records since 1948 at Norristown, 5 miles north-northeast, 320 ft lower. NOAA, through RCC-ACIS.
